如何在 Autofac 中注册许多开放通用 [英] How to register many for open generic in Autofac

问题描述

我是 Autofac 的新手(不是 DI).情况如下:

I'm new to Autofac (not to DI). Here is the situation:

我有这些接口:

public interface IQuery<out TResult> : IQuery { }

public interface IQueryHandler<in TQuery, out TResult> where TQuery : IQuery<TResult> {
    TResult Handle(TQuery query);
}

并且在我的解决方案中有很多实现:

and there is a lot of implementation of them in my solution:

class GetPersonQuery : IQuery<PersonModel> { }
class GetPersonQueryHandler : IQueryHandler<GetPersonQuery, PersonModel> { }

class GetArticleQuery : IQuery<ArticleModel> { }
class GetArticleQueryHandler : IQueryHandler<GetArticleQuery, ArticleModel> { }

class GetSomethingQuery : IQuery<IEnumerable<SomeModel>> { }
class GetSomethingQueryHandler : IQueryHandler<GetSomethingQuery, IEnumerable<SomeModel>> { }

等等.我目前正在像这样注册它们:

and so on. I'm currently registering them like this:

builder.RegisterType<GetPersonQueryHandler>()
    .As<IQueryHandler<GetPersonQuery, PersonModel>>();

builder.RegisterType<GetArticleQueryHandler>()
    .As<IQueryHandler<GetArticleQuery, ArticleModel>>();

builder.RegisterType<GetSomethingQueryHandler>()
    .As<IQueryHandler<GetSomethingQuery, SomeModel>>();

// blah blah blah

如您所见，我有许多相同的注册.在 SimpleInjector(我之前使用过)中，我可以通过一行来注册所有这些:

As you can see, I have a many same registrations. In SimpleInjector (which I was using before), I could register all of them by a single line:

container.RegisterManyForOpenGeneric(
    typeof(IQueryHandler<,>),
    AppDomain.CurrentDomain.GetAssemblies());

是否可以在 Autofac 中执行此操作?

Is it possible to do this stuff in Autofac?

推荐答案

您可以使用 Autofac 做到这一点，您只需要使用 扫描功能并使用AsClosedTypesOf方法:

You can do this with Autofac you just need to use the scanning feature and use the AsClosedTypesOf method:

AsClosedTypesOf(open) - 注册可分配给开放泛型类型的封闭实例的类型.

AsClosedTypesOf(open) - register types that are assignable to a closed instance of the open generic type.

所以您的注册将如下所示:

So your registration will look like this:

builder.RegisterAssemblyTypes(AppDomain.CurrentDomain.GetAssemblies())
       .AsClosedTypesOf(typeof (IQueryHandler<,>)).AsImplementedInterfaces();

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